<template>
  <div class="selection-component">
      <div class="selection-show" @click="drop">
          <span>{{selection[nowIndex].label}}</span>
          <div class="arrow"></div>
      </div>

        <div class="selection-list" v-if="isDrop">
            <ul>
                <li v-for="(item,index) in selection" @click="sele(index)">{{item.label}}</li>
            </ul>
        </div>
  </div>
</template>

<script>
export default {
    props:{
        selection:{
            type: Array,
            default:[{
                label: 'test',
                value: 0
            }]
        }
    },
    data(){
        return{
            isDrop: false,
            nowIndex:0
        }
    },
    methods:{
        drop(){
            this.isDrop=!this.isDrop
        },
        sele(index){
            this.nowIndex = index;
            this.isDrop=!this.isDrop;
            this.$emit('on-change',this.selection[index])
        }
    }
}
</script>


<style scoped>
.selection-component {
  position: relative;
  display: inline-block;
}
.selection-show {
    width: 60px;
  border: 1px solid #e3e3e3;
  padding: 0 20px 0 10px;
  display: inline-block;
  position: relative;
  cursor: pointer;
  height: 25px;
  line-height: 25px;
  border-radius: 3px;
  background: #fff;
}
.selection-show .arrow {
  display: inline-block;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid #e3e3e3;
  width: 0;
  height: 0;
  margin-top: -1px;
  margin-left: 6px;
  margin-right: -14px;
  vertical-align: middle;
}
.selection-list {
  display: inline-block;
  position: absolute;
  left: 0;
  top: 25px;
  width: 100%;
  background: #fff;
  border-top: 1px solid #e3e3e3;
  border-bottom: 1px solid #e3e3e3;
  z-index: 5;
}
.selection-list li {
  padding: 5px 15px 5px 10px;
  border-left: 1px solid #e3e3e3;
  border-right: 1px solid #e3e3e3;
  cursor: pointer;
  background: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;

}
.selection-list li:hover {
  background: #e3e3e3;
}
</style>
